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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bd98a4056415c018b931fdfdeb08892f2fcd817281c0e4bbe9d54806d73e7ec' 
  AND token = 'WF8Z1c7MmHLPOTVSelpy14/3gffoAm/Lkt7CQSWZh+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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