SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '364c336c07160ae2b7bc6b852f75d507a0427a8b9708f9e0aa12c12d204bdaae' 
  AND token = 'slsH29/3VR63jSsCE+p/2etg4JJa+WvUrYFGuLjY5ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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