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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1792d95ce98578a4e2a8f956644ebf0bc92bfc85053b8eaaa02fba0015ca0d9c' 
  AND token = '/6Crnt1Ck5kg9Hu3Yu/nsIpIYL/T5PGN/5G6zRAkj4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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