Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f210b78513df380c7582f8985006762a9a134c4445c4a3a82ddd4bd4b649063b' 
  AND token = 'jedjb2zOHy8D5tihSQRJ6vGPO/m//BEeTEDHSEiOQG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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