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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40ca4f7b96dccfa562731e9f208cd023059239425e920992bbb41f6bdc22e071' 
  AND token = 'xIYZQfAaiSNCqezHX9NJ7xKPqIe3b9nw1dhko3FMVv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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