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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '971acc1cae869f9921a8e9a3632770c39ce59d9a42352889357ebf577aea7ec8' 
  AND token = 'AT5eGxMkcPL04qvucCvtcQImGEmGqGOCOaf5TY++2OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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