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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b59698cac56945cbc6bf4ec01b9e9293d253692a32743f76dd584b7dde003392' 
  AND token = 'RgS//63SYu/Z0MRjKTXNyZPZSYnRsIBDwsVR+3rPyO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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