SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c5d7fd8110091d4dfb95fb56d95c3b747d20749b08b8b01f1a7264c7aa3a09' 
  AND token = 'HXWhJVwqZxqhgCpFaOtAHduIYZZTwiVvG21L2lLhAak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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