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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b01dd969d2c00f2fa3b7d4da2afc081fea43d6243f79e225b69c0ac90b6bf676' 
  AND token = 'jhfQ9DFrgcU5azXk7ptK9qpGsNHdw0eyFjVVcFkhKRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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