SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10aa7f3673493d6f5482ec68aabd563f96b5561723bcc44978b9cf2519b311ec' 
  AND token = '7u5LbBj9/+18zFKCdwXxfYCmNEZPgHcGqZRt1dqcOJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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