SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebdbd1c6fde1763831398b679d18ec4ee5733a0b656486c7b122c0579a0e0272' 
  AND token = 'wLTEYT7ZH1HqJzI/KlrCvOFfeG3J6e9Nf+wVk++82Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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