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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd63b759c726acff8f3611ac842aaed6fac076093172bcab805dd5cd8b7f9cf76' 
  AND token = '1gP39snITv6cKIxeWSVppp8eaWb/Keif6Tw7Jc60wbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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