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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '709c23a39b8b51451a67cb1e7e66c74c9ab8b168892ad66f7cb635378050fe09' 
  AND token = 'SmGz0XDO3So6qEZxuVevsgR0w/Z3HFd93OTpEc48G28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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