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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e89d7281b8b361a8b544daccf75ecdbb18b8f9f2474d658fe944dcd5efae3842' 
  AND token = 'ScOzWM3sNAaAemHOt1S4JzpgeeRPPSGN/UfgNb0VZsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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