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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d8e83ef197cbfd61634dc2ad09649e7eb520e65a92c4b80210fea66356fff4d' 
  AND token = 'SK3tUPJCObKzA/+vX9HKSV9iTvUEt0rU51bdN9E5QRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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