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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e60d35d296fa54d8932a32ca5707b48f6abc0de45773fc3e5ed50e8dedbfc59' 
  AND token = 'AHwEcJjfbaW3JZYoeMonASzjfOqwUxlWnvxhRNW7V+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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