SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b9b3474662d5f7e17665ba674e8cd8cf98357da0d1554c555ca3eefd243b44' 
  AND token = 'yg8mLuvuh1CTG5T4h4QUZw2x8lBBp+97dugpjkuOF+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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