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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd37669c636e176a91721a104544880ff5d9bbff258913035911da287b9e05eae' 
  AND token = '/CEpXd438x3xqum8TCBo8aVd4jPP/Ef6Avbxknv255Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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