SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67608e45342b9f8886caac4f8997e7521eb1809e1bc5223a10dc09b11d323f98' 
  AND token = 'FnJXJ2kFVeSxERCUsLihdq3jH4IH+wJsYCBNIhrectA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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