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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa24557b2cc4ece9bf8438dbfb6dc635411d42e7c45a963e0b9fb03a13bc515f' 
  AND token = 'iIsKjIfEK8GSPVS16/5I4yI1ogEcBidS2M7b+71zQ8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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