SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea44e0e9a0caac2670feb36eefefc22160f68dfb7332d1d9fcd67398be3b62c9' 
  AND token = 'tYLGBBC4FqSvrzJDPjilGZbTvpI5s2RMOK5JbUbA1nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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