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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5515ab020ab906fb5fb738dfbe5b6dae5841816a6f844a7d70ca06afe7ca0d14' 
  AND token = '5KGJ3xNYqf6BWkuNT4Z5wAFmSh2MtvbDUiVo3P5AicM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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