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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0a7c25c4b0bb0ee620476a4b9acd4b87232ed626ee80d415bd8e97f262a5c5f' 
  AND token = '4OkMpVdM4howYDQRIuojcF5F2dnJ8gHHS3uNaBSPrgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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