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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04924151244c939cdfd1430d6094c3b9e5d2cfec9b1089b20639e1e848ec262f' 
  AND token = '5D30qeqqhaWiznnS3QXhmAs1y+C6pS8VgVh4f2jPnpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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