SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0134ac05a2e010a4beffc86c19774eaf221e2b71186f693d77d6bdd35750b759' 
  AND token = 'CKyLkWSW4tSxq/bHzVm/91IZKxJvur2wvYgY8txgwuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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