SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2299dac4d7bf6e137932d9cfffc9e4803df7193caed6f3808d14c274a810c76b' 
  AND token = 'YBGhqHD/7QQJ/amm6rkPPWtuElf4z/15TvGQUp57R2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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