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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2484ded0176404d0a5899e40e7a324b4cd19f7f8531b0ee36fbd79a2df0b013f' 
  AND token = '5G2m8CjnX26p9gTdcVl3L0t1A9ukuc9eydWbh8nHAi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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