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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '421666ac23c396b9f58addc7d89e6888d31e06bdc4198e641e9b0b866a33d761' 
  AND token = 'IrZPfiS124VTubnikS4ELtMXaGQ41mkrYiHnq/SbTeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}