SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f367865b0d215937c0c17675623d2d89d17919a2c06c69dc736a81c9361f17a6' 
  AND token = 'm/vwGSgDNl+i/gE4yKthOLjw5DUsP1zHRgX+sEiI+PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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