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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4db880fa2b2aa5a55949a12d73c37b89905af0966fdb7e76c284f702b13aad9d' 
  AND token = 'aT+EsKopQcft7SW34JYFy3Z3bum1eXkJPu0iiZqn3TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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