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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f585f94b500e0c2a3e7d5df228c8efd79ea1b7098e6f3d42e543ec807bd00a98' 
  AND token = 'KCbsTu4DJTSTuZfwf6yDuq1LbMWiLxEfpwBF7DQgyWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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