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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05d4266223174bbcf6862691127725c74300fa5c2a3a674cc783c60475918699' 
  AND token = '0GaQMKJeyVkJf2YxhXwe/JQkb4c4OSFpiUsYHpsiZfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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