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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d502c9edd0763554eecd8fc090a6e748c5224fe8cdc880d47b23c97d70b87f4' 
  AND token = '5LqKUw29JcEZ2DDQFRMp4KuuGB/oGcrDemLrNKjsZpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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