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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63a6a455f28ceae65547213943f766de2812df5933c81856a564313fc5395413' 
  AND token = '+e5UFTzU53Mk0A72B3ZAEDjTE4Yzn3c0ChYvz7bHA7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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