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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffbd4aa0797fc9c0d60752166b3281d356a26017084c8348e33c8adeb4829717' 
  AND token = '3RlGWiE4DO41F3oILbFtufVhescyLMe9XOUfqoJD19Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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