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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f0fa2a5b18c991a7e21a9859c65b1cc146ebec1e69261ad0ee9c2eed6955f63' 
  AND token = 'jEDNN1SQLva5j/9sIBoo2r254gk2snazDzTxt3xHHhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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