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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a24cf8b19c5e816d572c533dae19908407dc1592eeeaa4d1f9494bf6ad59488' 
  AND token = 'PgVDWqMP1FWOk1yTB7d4rIEnrIOL5SQ7FQqtcVcXe8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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