SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22fba48be7cea4f8a44d57795bd0a07326b1d82c8fc941c5e2748808d49382a0' 
  AND token = 'UgJowzMxgF9YM/poTZLy1uwB7SvCJYvvd7LpaK91r/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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