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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41665a23662bf2200c45a530bf47214e60f8ede67e61dfd304d4a252201e854f' 
  AND token = '6OzB2x7UNV9Y3bvQiNip/Wg03RZV3S09rIi1WxG1v4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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