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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f4329ec835161020a136ab91a1b5709356aaa7627c1cae1efaa57f3992f8011' 
  AND token = '8Z6rxHsNJiBVBAMF0NsAqKDUgoIGamHv03DZqIbdfxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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