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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '274dace552b69eff7f1ce1cba4f42ac7cb57f5eb96d266382604f9ec41fe572d' 
  AND token = '0VdDqa5Xfku/P7xwWzXIQmfpEX0WjG7dcXBDJWwLby0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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