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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a50b917a3cf9ab1e29e817ac2de0b76e6cb79d8b336eeae09a02eb6f441dedd4' 
  AND token = 'i+cN8/JcX2mXaUutS3hAWV9kOFLZ0/W+zIoW2QA5f1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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