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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938e2b21c57cd36df3d34ea64347742f781fbe11b02887e4c542ad58173b2f99' 
  AND token = '2OTk1Cwz2mHXaStOaHFVwDt4HFDqKBEbHUZlToq7n4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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