SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0458b67e13dfe666ad5cfcc5929d897d4df6b839c12c25fcd1c2e95e09ce0176' 
  AND token = 'JJLrlPrmvK4YPKsNVFY40QMHBMwgWA4GBFsECPYZgUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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