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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b4bb31603c4dd6c67ae9b8f58f905e3665de61ce819f67476c1d80295333464' 
  AND token = 'ZCGX3RIT9B842plBLQMzetxHUolDcQ4XX3IhVVwGNCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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