SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23dbe6f1d0eff6d9bc071ce862f96238a1c9d9560e4b4ed5443b3f52df2c9daa' 
  AND token = 'cGzneSNZQ6D1hJsgCGDM1zwg+NQLIEB0aGQp48SjWxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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