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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c96bc7d1aa34fbe0559e30c101afb9b2d00ae52391ce4b021ddce663fa37b3ec' 
  AND token = 'V5rz0oUoKxH2VpBBPljx8AsySvd+DwGi769MjTuKo0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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