SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3852e9009fc4c74dd25c9e1ac535561d47cdb1f02ae1c343d68dac96d5afb634' 
  AND token = 'yms9Tgdq+AZzw8VpMbAjRncHOXPjBmktAhYo4tU9Joc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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