SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87b3a63b122df3d625891012a572cc9017cfd567b6f414b72adfdaf71a691c2d' 
  AND token = 'Tuhz0rhxSaRY0/CboWPx11QKLcFU0eSWWnirmW9g7DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00143

JSON explain

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