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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98428c9d3b5fc145ec96f20adce7a68764864f4d32b63f629c8c0741b44dd55' 
  AND token = 'bGWl3bFbcEEdFt+ZBePDyXt5LcQ3xYoiHMc8gV0aFIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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