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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fd76ebab816d227850fe7cad7e3e9efd2a2c098c5c0152e5fae0ce1fd65911a' 
  AND token = 'dQpk+NEAqXCWakd7eo4HuT7W3lMrPOpubSH3eTn65sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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