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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0627483efc3c2e94a81b31a212139f0a02653df4474eb406eb12d6c89c8c2776' 
  AND token = 'kC6/brhIAvjVU2ELbteHx7xQdwX1LJRq8aLVPDSfMz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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