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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '461232037a5f6a007d76cf5a3071efc45466a1ced544d8b40c7cbde5f17560b2' 
  AND token = 'HRo/bPjcRaydqWayy/mlzHr50EQWyMZLTAwb6dC9I6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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