SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77216c60f2297b2b04c4f9b6bb5de144ca34201673781bd1f3564da00de8fddb' 
  AND token = 'fGiMLqjCPYE/4mg/wj6BzzIF7bZ4Amn5Ytm3b+kRZuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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