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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '813841fb30c1e8f6424b49ebfa85c4fdfe6fccb5f94a61da1b7e44c0f481fe35' 
  AND token = 'NxgwofJm1EJmT9BdKrt8cU1q2pcFtDPATw3xbTZJRVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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