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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8995a45f9111cd8a346d5121d7175a5c93ed6998e17ef04f591f9489cc003f5' 
  AND token = 'xCMaGEyJ+C5YjHJfNKdMP1OsYv1sPbWP4Ju2Pi71POY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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