SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74c71661786fad29c68d59922a2d74533f370ace987ed4eb15286fd0c2d9fdb2' 
  AND token = '0Y6YAHK8sjIohHdKG1X54yjiipX4FjwruDSTmz/5dZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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