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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2633a2dfe5998095d1f29f3b1d7b4363e5b41d6137251e9059ad892cfd36af35' 
  AND token = 'n+m24HM4PRMlrlbhJkZJT5WJHHzs5laYwb8XBNjs1sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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