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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67f18218b1201e039acf320897d1c032ef61134747c4f3c6466d5b43e7038074' 
  AND token = 'OINGngUg7wwuEf/Puf9pzUhu+J5ybNlsYdUT9ftHdO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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