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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdcb7fd42d7aa1ad60bf8d35ea669d2df0d6651a9d4cd8546985f2b3939644cf' 
  AND token = 'xS8i38F8EVTW7sqZUThCn5LRAXq28SHtw1XWa4PrYQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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