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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '077a738463b6d3a21f718e14dd3fcbf939349ca1f9de1ceb39c700c1cf9d1efd' 
  AND token = 'mv3iHWMSoNV+LY5XhSloJeFGuC4VyWGYM6IBbstQmOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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