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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdc57d6a673d328d3d114563bf5c07654f5e9e1270d759fb1ba07ac47cbed424' 
  AND token = 'JnComsWfUwdmq20cs5XJ99PY9balb7hhOKu91z8xWf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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