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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d7a2eb015041eb97a3e3322bb4c207e6dbe9116794223df5c71602946c171c6' 
  AND token = 'NApPTBKsIKNfZxMZKcR6qnD4TdeVoKj8btlLgdrIS9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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