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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '771b6ff36e546192e6067e10393a7ce52933dc301ebdb08cb45ce1edf718dec7' 
  AND token = '4+vc9kykk+0cFObeIR5SlRTEGtnjiEkX4/oud84qXrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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