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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfc2153ee4ef1985cb17ee27078e4b63d4552f05a8e7563c33aed3a804a56658' 
  AND token = 'T8EeJdsJYi9aVz2Jvr14UN0yHyrRD47PCyouq5voC9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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