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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f12a82e33f78a7657af54649e8eac010879eb4fe7514130a4283775b423c3d7' 
  AND token = 'uys/HpOrMrjsHuKnwZg7RxmCxWBAIkZZOFM8iaoCcpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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