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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf1abb05bacc00c5b89ee2bc7aca28acc7488e5b9f508af9da57c71018d7933c' 
  AND token = '85zsrFIcSXuX/IVILB1FXnso6c5GLAEDppSXGC14C8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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