SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd01a31fabb6d4bbbbccab1884642094f3ed63955a9553672c7f4c683958b023f' 
  AND token = '4+P/S2Q015W96uUxgq3jHxOMkqYYSlvQKUHTvu5ZVr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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