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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a80a992e4676f5209dec832c6efb9319347722cc5df9b3915fb5892abbe5adf5' 
  AND token = 'YmwxnnnFoY5p6tUDlQDQhWATcC5JJ3WBvpF06QCziTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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