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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '360fd3b42f1d2724141c3cec7705970fda308bedded703a424eaa09b3e08a520' 
  AND token = 'ZJt4uM9Auj5/G1qRnvhvdrAIX6WMZLWaT38Uj19MDmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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