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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984438dd6be173cc8c7f78988ed58339e419216afe8bc499b752b3cac3c868c4' 
  AND token = 'Zh9EuSc/8/oziAPUGD9hVZErhSfpR6EOxWj9BHwyzIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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