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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35362ad5c4e953cd87459a1b45e46861c0425895109faafe149906215c0cd668' 
  AND token = '1X5zRQym/7QmM9tDPueGZCM2V9NU0eCuilwhT9G8C6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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