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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '403e1f132494f92b70dd5096d8a162b5e157c6b9df34aeaa94f983271526d325' 
  AND token = '3SycjRRGkp02MTo8P1noQRhK6z/XKKhehx/uIP1KsP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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