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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0c33c7fab1c8a3e2ebe2bab885c120117adfec8561d6854dae7c2ff00cbba8f' 
  AND token = 'yYj9SkbXfTf5FJDHlOzioM6HMQOMVCBNzLoClVLuqMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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