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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ceb929b31b8b6a6f8cb1aa9b9e8eee0888aa158e69ab0722a3a4399386acfb1' 
  AND token = 'i9RF6/9+RY2wyUDdO0FLboFNplwX6TxGOOQcMZEQzlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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