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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a43e075864a4b8b3980d5c8274eb9c85c70a2384181fcebb8b8fe34ca91bb0e3' 
  AND token = 'K/JHJSptQ/9ui43K1QLCfdezUmC1jGhbnJ5knEi8J8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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