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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56fdaa81872d7c84afeff169481ac53495d46d3a6d5cc123db1dcfb9af17a5c3' 
  AND token = 'T7+IE+onyyGycdF8Z+kOrYWpEwz6o+9DpnbD2akYPZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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