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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1883b7faf0537365d200f38c53727b88f8039a5281620679d0eb581d3f6b594d' 
  AND token = 'c44FXlA/2btTrJz4gGy0CEtrm07WpKAC8JfjOyzP9TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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