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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e35e8d7e7a995e82e8fece25cddce734cbed13378df9b843fa3be955e29cbdd' 
  AND token = '1bkyQTA+f3ze+wfmCLWfwO0B/gdOrcYMPJSIsWh2wi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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