SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bb5c98dcb9df1d6f0c82920166b5ebab88c4d39492d6b53f91b7465743e89d3' 
  AND token = 'Zfxskl3XQ8PDIdnUYW/B1H+ueUlznGShxPXpPlSPuBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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