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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '040efeb80a88d0641a6f7c65052f2b1b8d9b8fa64e482f59674fe9d84b258352' 
  AND token = 'AZGxTUc4HQQ3PvS25H4qff0eSy0AlxGk0dyG4VW4DEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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