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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b709096ff734233b675edb6ba85d9f4c39649c97fc36fde788367d871bf7d1d9' 
  AND token = 'TkfZT/yCdZDtWby5wxqLLwU1A3auTHckWM+xeCLoC+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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