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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2746f9697914635ed04425b3c9bfc7e76a4a6d617435e5bd704dc7b1d86f7eb7' 
  AND token = 'COIBGZ9BkaZIF2i2CGzhblp0/o+sblqBFvR20Tqo7zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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