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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cef4c108030316422c2cdda642cb1f50f2f7cef9aab17a50e922e01ea3b7bda4' 
  AND token = 'oyGPimuagrEwQxVZ38Aq6SYx2eQM4ggcO9gkhhIfAd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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