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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9adbba346258f6b001f9fb8893a7f1647f665dbc38bc3fc486a6827f0650e62b' 
  AND token = 'qIrL7N26HrcW//3HTnk49LjRqKs5Z85CtssoL+fAjkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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