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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26f7846bbfed7e94c824a6063c5bd96c8a8c00c8aa20d82c1b14391db4196779' 
  AND token = 'bb15P6D6OZPRbe2SWYa1mYcXMYO9qoz61cOToYWXU5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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