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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a963efaf1755c81ae99002dc72bb9784b8563f057b2ce8119f4919db636c972' 
  AND token = '30zZT6TBDB+B8KBVl1oNWNCqw2iJH2mHUy7yTVeoIr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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