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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '202a1ad4702c8f57e1448ea9bd2b45c8dc4570c8967114352cc317905a65684b' 
  AND token = '/E2n6677tGIJGsmzIMnRgy9Dhj4iNyfGgq8cWo+O9vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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