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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cba67f176aaeb863a5e227d8c5485bff5ebadf45995ce88d526bd0be2ce4433a' 
  AND token = 'YJS2Xf5NzaSLn15J0yYVctQXEVD+jHt8AvfOONqU8S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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