SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85f3ec8e0726220ba154a251c1aefd8c9046942c0b5f29033f67d9c67293a064' 
  AND token = 'bT46Iv+uFzAKAE3GWfRxz3e2wH1/VaHwfYhpbS7U8bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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