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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2601ddbb1bd203f4d8e49ff9c7f4190fd2f9af0bb4f020ba16c1e610cc9b543f' 
  AND token = 'cbytg1+4O6PbPUpJ+KlWXhEuZww2dUOUEQQMqnh2juc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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