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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1840648b3a42b4a7c70108f4ff35b053c4dcbec66b21f4af83ba58bb725c5a48' 
  AND token = 'iAMrX2bJ4SftImNLCSneTnyrENTz0TOs/9WMnqCh+50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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