SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76bd1045b4809c357c4e919643b1af2648b673774b204dcb1546f5f20b505a6b' 
  AND token = 'ogbfbS+Sw+PD+MkSzlEj+YW/hEjgllH47PFwGBmtwbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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