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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6329c5aa7f0fa357df708c1af1bbfd1d9266c80df952136d029086ea11bf63ff' 
  AND token = 'BAn6QQr2QyYa8WZlR6z5mL0brmTAaleeZV+ZVBtbyy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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