SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dfc73b104ba6f5c3e0382f4944b818a3637a6a2b2e863cfc1644275a9b0e40b' 
  AND token = 'DtZGvUKYw5n4RT92DBLBFNRK6/P2dyGP8L97tUuIvGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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