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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d0a9c810db79b5981b84370c37e47dad21fabfa4ea9bbc8e5fe2547cef1602' 
  AND token = '81I6kidF0ufPkMYOnpIGV5CtS0UE/B1BjD6nR9W/tFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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