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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fa6e60fb80626981348f50d6cb8a0e7232f3816989f808463f87ddfe0dfb68b' 
  AND token = 'wQOZEBgUJC0qUKwNvIHnOOl9m37EZAAYgxITCDwK0xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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