SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4587afa6ff09cb7f86ff7955b9de99c5b87407cdeac0f45ae40bc1135920681e' 
  AND token = 'wHqIJhN8V1Sv6VbFwLLpDrHC0TKElqg+2qpuhznPFOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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