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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa39ff2ca66103b5dc41418a66aaad6c70ce77f1840b2677c4ee907ff7543ba' 
  AND token = 'UXajfDZ4Z0LKsJr8me1FzkLC4aZVZWahPJh7YuWGGVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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