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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '197b8c0411749acdb63318aab4f47bda00e3e435c0e93b5b2b12c7cda21af26e' 
  AND token = '35s3UX1ZAXe5FKQlC64p7CkdOaeQcO55hqkjCcoZd1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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