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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '999847daccad1e8201e67fa4f1653f67c0eba59638c790740605ecdf68ac2c2f' 
  AND token = 'v0PWhL6ZULe1tRfOKRxuviqwaknruMBhX1i3uSiHw8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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